From the Flickr page (accessed 2018-11-16):
You are invited to offer identifications and comments on the more than 5000 photographs that are held in the Fonds Louis Robert of the Académie des Inscriptions et Belles-Lettres at the Institut de France in Paris. These photos have been digitized from glass plates, negatives, and prints through the initiative of Thibaut Boulay and Anne-Valérie Pont with funding from the Institut Universitaire de France. They are displayed all together in Photostream and also in two separate albums according to whether they are on glass plates or on prints and negatives.
These images are, like other material in the Fonds Louis Robert (squeezes, carnets, and correspondence) the joint responsibility of Jean-Louis Ferrary, membre de l’Institut, and Glen Bowersock, associé étranger de l’Académie. The presentation of these images through Flickr has been made possible by Jonathan Peele of the Institute for Advanced Study in Princeton, New Jersey, USA.
Interested viewers are urged to sign up with Flickr at no cost. This will facilitate providing comments, which will be available to Professors Ferrary and Bowersock.
Unpublished inscriptions that may be found among the photographs in this archive are now in the public domain, and they may be published with acknowledgment of the Fonds Louis Robert at the Académie des Inscriptions et Belles-Lettres.